Create TopoSort-BFS.cpp #36
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Topological-Sort-BFS
Topological sorting for Directed Acyclic Graph (DAG) is a linear ordering of vertices such that for every directed edge u->v, vertex u comes before v in the ordering. Topological Sorting for a graph is not possible if the graph is not a DAG.
Intuition- indegree zero nodes won't have any edges so they are placed before. Indegree is being reduced as zero indegree nodes were taken beforehand. We do this using a queue.